Yoplait has asked customers to return any raspberry set yogurts that appear runny and green in colour.
The sub standard yogurts were produced when cleaning fluid used to clean the lines got into some pots.
According to a spokeswoman there is no health risk from the yogurts.
A helpline has been established and refunds will be made. The yogurts were in about 4,800 pots, but only a few hundred are believed to have been affected.
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All the products from the batch have been withdrawn, but might have been already bought.
The yogurts in the batch can be recognised by the best before date on the lid of December 7th.